HWM Ordnance Survey Abbreviation

HWM has various meanings in the Ordnance Survey category. Discover the full forms, definitions, and usage contexts of HWM in Ordnance Survey.

High Water Mark

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Permanent mark that indicates a high–water datum That in London was established by Act of Parliament in 1800, and is cut into Hermitage entrance to London Docks Is 12–53 feet above mean sea level at Liverpool

Ordnance Survey

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